Brake mechanism for loom warp-beams.



No. 871,278. PATENTED NOV. I9, 1907.

F. JOHNSON. BRAKE MECHANISM FOR LOOM WARP BEAMS.

APPLICATION FILED FEB. 26, 1907.

A TTORNE Y FRANK JOHNSON, OF NEW YORK, N. Y.

Specification of Letters Patent.

BRAKE MECHANISMEFORQLOOMgWARP-BEAMS.

Patented Nov. 19, 1907'.

Application filed February 26. 1907. Serial No. 359.357.

T o-all whom it may concern:

Be it known that I, FRANK JOHNSON, a citizen of the United States,residing in the city of New York, borough of Brooklyn, in the county ofKings and State of New York, have invented a certain new and usefulImprovement in Brake Mechanism for Loom Warp-Beams, of which thefollowing is a specification.

The invention relates more particularly to looms for weaving Wirefabrics and to the let-off mechanism for such looms.

The object of the invention is to provide simple and positively-actingbrake mechanism for automatically lettingoif a prede termined length ofwarp-wires at proper intervals.

The invention consists in certain novel features and details ofconstruction by which the above object is attained, to be hereinafterdescribed.

The accompanying drawings form a part of this specification and show apreferred form of the invention as applied to a loom, with so much ofthe feed and weaving mechanism as is necessary to show the relation ofthe invention thereto.

Figure 1 is a side elevation of a loom equipped with the improved brake.Fig. 2 is an elevation of the opposite side. Fig. 3

is a vertical section partly in elevation showing the controlling meansfor the let-oif mechanism. Fig. 4 is a faceview of a portion shown inthe preceding figure. Fig. 5 is a diagram showing the electric circuit.

Similar letters of reference indicate the same parts in all the figures.

A A are the side-frames of the loom, and B is the batten or lay swungfrom centers B B at the top of the frames and equipped with a reed andshuttle-throwing means, not shown, but which may be understood to besimilar to that described in Letters Patent to me dated A ril 12, 1904,No. 757,121. The lay is causec to swing by double cams E carried on themain shaft E and makes two boats or oscillations to each pick, as in theabove patent.

At one end of the shaft E is a bevel gearwheel E meshing with a similarwheel F on the upper end of an inclined shaft F carrying at its lowerend a smaller beveled gear- WheelF in mesh with a similar wheel G on ahorizontal shaft G extending transversely of the loom parallel with andin rear of the main shaft E and revolving at the same rate.

J is a controller or commutator carried on the projecting end of theshaft G, consisting of a circular disk of metal insulated from the shaftand having a spring contact-piece J on its outer face adapted. to makewiping contact with a fixed contact-point K carried on an arm A of theframe, and connected to a binding-post K. Another fixed arm A carries aspring J in continuous wiping contact with the inner face of the diskand serves to complete an electric circuit through the latter and anyelectric devices connected to the binding-post K. The circuit is shownin Fig. 5.

The warp-beam is marked C and carries the warp-wires as usual. It has adrum 0 at one end partially encircled by a brake-strap or shoe Cattached to a bltliO-lQVOl C held by a weight C in position to hold thedrum and warp-beam against revolving, and raised to release thewarp-beam by the action of a solenoid M fixed to the frame, andreceiving a core M attached to the brake-lever.

The solenoid is in the circuit and when the latter is completed throughthe spring contact-piece, is energized during such short period ofcontact and draws in its core M to lift the brake-lever and permit ashort length of warp-wires to be drawn oif. The warpwires are led over aguide-roller I) having at one end a pinion l) in mesh with a gearwheelon the warp-beam so as to revolve therewith and at the other aworm-wheel I) engaged by a worm l) rotated to turn the guide-roller andwarp-beam by any suitable feed-mechanism, which may be understood forthe purposes of this description to be operated electrically.

The warp-wires are led from the inner face of the warp-bcam upwardlybeneath and partially around the outer face of'thc guideroller so thatthe opposite rotation of the beam and roller due to their gear andpinion tends to move them in the same direction as the travel of thewarpvires thereovcr.

The electric feeding-device for the worm D is only partially shown D' isa ratchetwheel on the end of the wormshaft, engaged by a pawl, notshown, actuated by connections from a bent-lever l which 13 oscillatedby the movement of an armature N toward the cores of an electrmmagnet Nenergized by the current through the binding-post K and forming part ofthe circuit.

The binding-post K is set in a concentrically curved slot a in the arm Aso that it may be adjusted in the path of the springcontact J and theaction of the brake and feed mechanisms accurately timed relatively tothe movements of the heddles and lay.

Although I have described the brake as released by the action of asolenoid, and the worm as actuated by an electromagnet, it will beunderstood that the electric energy may be utilized in either of theseforms in either or both situations, or the feed mechanism may beotherwise operated if preferred;

and the brake may serve with looms of other types than the wire loomshown.

I claim In a loom of the'character set forth, a warp-beam, a brakethereon, an electrically actuated releasing-means for said brake, anelectric circuit in which said releasing-means is located, and acontroller operated by a moving portion of the loom for making andbreaking said circuit.

In testimony that I claim the invention above set forth I afliX mysignature, in pres ence of two witnesses.

FRANK JOHNSON. Witnesses:

CHARLES R. SEARLE,

M. A. BOND. -..4 v

